Produção Nacional
Revisado por pares
Parâmetros morfométricos dos reservatórios Santa Cruz e Umari, semiárido do Rio Grande do Norte, Brasil
2015; INSTITUTO DE PESCA - APTA - SEC. DE AGR. E ABAST. - SP; Volume: 41; Issue: 2 Linguagem: Inglês
ISSN
1678-2305
AutoresRodrigo Sávio Teixeira de Moura, Rafson Varela dos Santos dos Santos, Yuri Vinicius de Andrade Lopes, Gustavo Gonzaga Henry-Silva,
Tópico(s)Fish biology, ecology, and behavior
ResumoThis study aimed to describe the morphology of Santa Cruz and Umari reservoirs, semiarid region of Rio Grande do Norte. The survey was conducted in December 2012, with aid of an echo sounder coupled with DGPS. The navigation went in lines perpendicular to the coast of the reservoirs. The bathymetry in Santa Cruz was based on a total of 35,971 pairs of points and in Umari, 26,575. The Santa Cruz reservoir had 15,984 m in length, 13 m average depth and maximum depth of 38 m. Umari presented for these same parameters 14,227 m, 8 m and 28 m, respectively. The total water volume recorded for Santa Cruz was 295,858,761 m³ and for Umari 114,866,034 m³. Although with lower volume, Umari showed greater perimeter 110,887 m. The hipsometric curves show that in Umari there is an increased volume of water at low depths, facilitating the entry of light and providing greater support to the biological productivity, compared with Santa Cruz. The highest values of Fetch and the smallest depth were found in Umari, which possibly leads to increased sediment resuspension in this reservoir, which can cause higher loads of nutrients. A higher proportion of coastline in Umari favor the colonization of the margins by plant communities. The reservoirs in particular Umari, showed low relative depths, a possible factor that increases thermal instability and hence greater mixing of the water masses, facilitated by the wind.
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